What eligibility criteria must Mrs. Radford meet to enroll in Medicare Advantage?

To enroll in a Medicare Advantage plan, an individual must be entitled to Medicare Part A and enrolled in Medicare Part B. This requirement ensures that the individual is eligible for the comprehensive coverage that Medicare Advantage offers, which typically includes all the benefits of Parts A and B, along with additional services such as vision, dental, and hearing coverage. Being entitled to Part A usually means that the individual has paid Medicare taxes for the required number of quarters, while enrollment in Part B is necessary to access the full range of services provided by Medicare Advantage.

The other criteria mentioned are not necessary for Medicare Advantage eligibility. For example, there is no requirement for someone to be a naturalized citizen or to provide proof of a chronic illness. Additionally, being under 65 can be applicable in certain situations, especially for those who qualify due to disability, but it is not a general requirement for all enrollees. Therefore, the criterion that Mrs. Radford must meet is specifically being entitled to Part A and enrolled in Part B.